Why not get an Optoma projector too?
Pretty much any projector will work just fine. The more money you spend, the brighter it will be:
http://www.optoma.co.uk/allprojectorsOrd...
Just make sure the projector has the type of input that you need for your game or DVD player or whatever.
It depends what you want to use the screen/projector for.
Presentations? Go for something that has a high gain so that you can have the lights on and get a multimedia projector that supports XGA resolutions.
Home Theater? Get a neutral white screen that has an even 1.0 gain and is in the 16:9 ratio rather than 4:3. Go for a 720p or 1080p home theater projector like the Panasonic PT-AX200U or PT-AE2000U.
Projectors are screen independent really. Just get a highly rated projector and a well rated screen. The projector quality makes more of a difference than the screen quality IMO.
This site is one of the best resources on the internet:
http://www.projectorcentral.com